Apple tree rootstock named ‘Mich 96’

ABSTRACT

A new and distinct  Malus domestica  plant used as a rootstock that exhibits a vigorous root system and drought resistance.

Botanical classification: Malus domestica.

Varietal denomination: ‘Mich 96’.

BACKGROUND OF THE INVENTION

The present invention comprises a new and distinct cultivar of clonal Malus domestica used as a rootstock known by the varietal name ‘Mich 96’. The new variety was discovered in the Tambov region of Russia in the early 1960s. The new variety is the result of a cross between semi-dwarf apple rootstock ‘13-14’ (female parent, unpatented) and dwarf apple rootstock ‘Paradiska Budagovskogo’ also referred to as ‘B9’ or simply ‘Bud 9’) (male parent, unpatented). The purpose of the breeding program was to develop winter hardy rootstocks with good rooting, pest and disease resistance, and high productivity. The new variety exhibits similar anthocyanic colored leaves, bark, and wood to both parents, but has better rooting than both parents. Further, the new variety has anthocyanic shoots that are similar to ‘Paradiska Budagovskogo’ (B9), but has better hardiness, improved frost resistance, and higher output of layers per 1 hectare. The new variety has been trial and field tested and has been found to retain its distinctive characteristics and remain true to type through successive propagations. The following characteristics distinguish ‘Mich 96’ from other varieties known to a representative of the breeder:

-   -   1. ‘Mich 96’ has a vigorous root system;     -   2. The wood of ‘Mich 96’ is moderately strong and the variety         does not require additional support;     -   3. ‘Mich 96’ endures temperatures as low as −15° C. to −16° C.;     -   4. The output of two year old ‘Mich 96’ trees grown in a nursery         is 80-100%;     -   5. ‘Mich 96’ trees begin to bear fruit early at their 3^(rd) to         4^(th) year after planting and quickly increase in harvest         volume;     -   6. The average yield capacity of ‘Mich 96’ is 20-25 trees per         hectare;     -   7. ‘Mich 96’ is only minimally affected by pests and diseases;     -   8. ‘Mich 96’ is drought resistant; and     -   9. In the orchard, ‘Mich 96’ shows little to no young growth.

DESCRIPTION OF THE DRAWINGS

The accompanying photographic drawings illustrate the one year old ‘Mich 96’ rootstocks produced from layer propagation and grown in Dundee, Oreg. The color is as nearly true as is possible with color illustrations of this type:

FIG. 1 shows ‘Mich 96’ rootstocks in layer beds;

FIG. 2 is a close-up view of a ‘Mich 96’ rootstock;

FIG. 3 is a view of an unrooted ‘Mich 96’ rootstock;

FIG. 4 is a close-up view of the leaves of the new variety; and

FIG. 5 is a close up view of the bark of the new variety.

DESCRIPTION OF THE PLANT

The following detailed description sets forth the characteristics of the new cultivar. Some of the data which defines these characteristics was collected outside under natural daylight on plants produced by asexual reproductions via vertical layering propagation carried out in the Tambov region of Russia of Russia. However, some of the data was collected outside under natural daylight on one year old plants produced by asexual reproductions via vertical layering propagation carried out in Dundee, Oreg.; this data is indicated by an asterisk. When available, color references follow The R.H.S. Colour Chart of The Royal Horticultural Society of London.

TREE

-   Age: 10 years. -   Size: 1.5 m. -   Rooting*: Very strong; double the root mass when compared to apple     rootstock ‘Malling 9’ rootstock. -   Density: 5×2 m. -   Form: Branching. -   Production: Average. -   Growth type: Apical. -   Trunk:     -   -   Size.—10 cm in diameter.         -   Surface texture.—Rough.         -   Bark color*.—59A.         -   Lenticels.—Length: 1.7 mm. Width: 0.2 mm. Color: 155B.             Shape*: Oval. Length*: 1.0 mm. Width*: 0.5 mm. Color*: 155D.             Density*: Approximately 25 lenticels per centimeter. -   Branches:     -   -   Diameter.—2.0 to 3.0 cm.         -   Surface texture.—Rough.         -   Color.—185A.         -   Average crotch angle.—Close to 90 degrees.         -   Bud arrangement.—Alternate and approximately 3.0 cm apart.         -   Internode length*.—Varies from 2.0 to 3.0 cm. Lenticels:             Shape and size: Rounded and small. Color: Whitish. -   Leaves:     -   -   Length.—About 85-115 mm.         -   Width.—About 60-80 mm.         -   Form.—Egg-shaped.         -   Texture.—Smooth.         -   Apex.—Acute, with light pubescence relative to the central             rib.         -   Margin.—Big, saw-formed crenation.         -   Pubescence.—Upper surface: Light. Lower surface: Light.         -   Color.—Young leaves: Upper surface: Dark red. Lower surface:             Light lilac. Mature leaves: Green with a dull tint.         -   Length*.—9.2 cm.         -   Width*.—5.2 cm.         -   Form*.—Ovate.         -   Texture*.—Smooth.         -   Thickness*.—Moderate.         -   Apex*.—Acute.         -   Base*.—Mostly symmetrical.         -   Margin*.—Serrate.         -   Pubescence*.—Upper surface*: Slight to none. Lower surface*:             Moderate.         -   Color*.—New, young leaves*: Upper surface*: 187A. Lower             surface*: 187A. Mature leaves*: Upper surface*: 139B. Lower             surface*: 139C.         -   Petiole.—Length: Short. Diameter: Average. Color: 143A.             Shape*: Straight. Length*: 1.0 cm.         -   Veins.—Venation description: Central rib is slightly raised.             Venation description*: Net-like. Color*: 60C. -   Flower buds:     -   -   Pedicel.—Length: 1.5 cm. Diameter: 3.0 mm. Color: Dark             lilac.         -   Bud.—Length: 1.5-2.0 cm. Width: 0.7 cm. Color: Dark;             wine-like.         -   Dormant bud*.—Length*: 3.0 mm. Width*: 2.0 mm. Color*: 202C. -   Flowers:     -   -   Bloom timing.—From May 9th to May 25th; average is May 13th             to May 15th.         -   Blooming period.—10 to 12 days.         -   Pollination.—Cross.         -   Fragrance.—Faint.         -   Petals.—Number: 5. Length: 1.2-1.5 cm. Width: 0.7-1.0 cm.             Color (generally 143A): When opening: Upper surface: Dark;             wine-like. Lower surface: Dark pink. Fully opened: Upper             surface: Bright pink. Lower surface: Dark pink.         -   Pollen color: Dark cherry colored. -   Fruit:     -   -   Date of picking.—Aug. 15, 2008.         -   Size.—Axial diameter: 2.5-3.0 cm. Transverse diameter:             2.0-3.5 cm. Form: Rounded.         -   Cavity.—Depth: 4.0-5.0 mm. Breadth: 10.0 mm.         -   Basin.—Depth: Little. Width: Narrow.         -   Skin.—Thickness: Thin. Tendency to crack: Not recorded.             Color: Dark red.         -   Flesh.—Aroma: Absent. Color: Dark red. Eating quality:             Mediocre, not edible, astringent tasting.         -   Seeds.—Number perfect: 5. Number in one cell: 1 to 2.             Length: 5.0 mm. Breadth: 4.0-5.0 mm. Form: Round and             elongated. Color: Reddish-brown.         -   Stem length.—25.0-30.0 mm.         -   Use.—For processing.         -   Shipping quality.—Weak.         -   Keeping quality.—Very poor. -   Tree winter hardiness: High. -   Bud winter hardiness: High. -   Drought tolerance: Average.

MULTIPLICATION ABILITY

-   Layering: Vertical; horizontal. -   Hardwood cuttings: Good multiplication by hardwood and root     cuttings. -   Softwood cuttings: Good in the greenhouse.

PATHOGEN RESISTANCE

-   Fungal disease: High. -   Insects: High.

PERFORMANCE AS ROOTSTOCK UPON GRAFTING

-   Root sprouts (suckering): Very good, fibrous roots. -   Anchorage: Sufficient. -   Compatibility: No recorded incompatibilities to date. -   Vigor: The rootstock induces dwarfing of the scion variety grafted     onto it. 

1. A new and distinct variety of Malus domestica rootstock, as illustrated and described herein. 